EUVD-2026-43250
GHSA-q4cr-cr7q-hp2f
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable JSON-RPC endpoint, low complexity; PR:L because a valid account is required; C:H/I:H because owner-role access exposes all project data and permits arbitrary user/data modification.
Primary rating from Vendor (VulDB).
CVSS VectorVendor: VulDB
Lifecycle Timeline
3DescriptionCVE.org
A vulnerability has been found in Leantime up to 3.8.0. This impacts the function editUser/addUser of the component JSON-RPC Endpoint. The manipulation of the argument role leads to improper authorization. The attack is possible to be carried out remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
AnalysisAI
Privilege escalation in Leantime up to 3.8.0 allows authenticated low-privileged users to elevate their role to owner by manipulating the role argument in JSON-RPC requests to the editUser/addUser endpoint. The server fails to verify whether the calling user is authorized to assign elevated roles, a CWE-285 Improper Authorization flaw. A public proof-of-concept exploit has been disclosed, and the vendor did not respond to coordinated disclosure, meaning no patch is confirmed available.
Technical ContextAI
Leantime is an open-source project management application with a JSON-RPC API surface. The vulnerable endpoint exposes editUser and addUser functions that accept a role parameter; the application fails to enforce authorization checks verifying whether the authenticated caller has sufficient privileges to assign a given role value. This maps to CWE-285 (Improper Authorization), distinct from authentication bypass - the user IS authenticated but the system does not restrict which role values they may set. The CPE (cpe:2.3:a:n/a:leantime:*:*:*:*:*:*:*:*) covers all versions through 3.8.0. The bytium.com POC research titles this as 'low-priv to owner', indicating the role elevation reaches the highest application privilege tier.
RemediationAI
No vendor-released patch has been identified at time of analysis - the vendor did not respond to the coordinated disclosure. As a compensating control, administrators should restrict external access to the JSON-RPC endpoint at the network or web server layer (e.g., block the JSON-RPC route via WAF rule or reverse proxy ACL); this prevents remote exploitation but may break API-dependent integrations. If internal access cannot be blocked entirely, enforce network segmentation to limit which hosts can reach the endpoint. Review all existing user accounts for unexpected role elevations, especially any low-privileged accounts that now hold owner status. Monitor https://vuldb.com/cve/CVE-2026-15509 and the Leantime project repository for a patched release. Do not rely on application-level workarounds as the root authorization check is missing from the server-side code.
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Same weakness CWE-285 – Improper Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
Leaving vuln.today